For the exceptional situations where the optimizer cannot choose an optimal query execution plan, DB2 has added features such as the SELECTIVITY clause and optimization guidelines.

对于优化器不能选择最佳查询执行计划的例外情况，DB 2已经增加了诸如selectivity子句和优化指南之类的特性。

youdao

Exceptional customer service, an easily navigable website and value-added articles, all serve to optimize a member's ability to choose the perfect rug for the best value.

卓越的客户服务，简便的导航网站以及各类增值物品，所有这些都服务于会员，提高会员能力，帮助其买到最物美价廉的商品。

youdao

The exceptional provision should be added to it.

侵占罪应增加例外的规定。

youdao

To the contrary, in their useful lives they added exceptional shareholder value in earnings and lifetime contribution.

FORBES: Don't Fear the Fad

"But clubs like City, Manchester United and Chelsea will also always try and sign the exceptional player, " added Vieira, when asked if the English Premier League champions were no longer interested in signing players such as Atletico Madrid striker Falcao, who is expected to leave the Spanish club next summer.

CNN: October 10, 2012 -- Updated 2153 GMT (0553 HKT)

"It's never enough time to prepare a team in one week but this is an exceptional situation, " Hiddink added.

BBC: Chelsea confirm Hiddink as coach